Installer VISE VCT Format (Big Endian):

SVCT Chunk: Header
uint32 - SVCT
byte[32] - unk
uint32 - Offset to CVCT

CVCT Chunk: Archive Map
uint32 - CVCT
uint32 - Chunk Size (CVCT + All DVCT + All FVCT)
byte[6] - unk
uint32 - Entry Count
uint16 - unk

Each entry is either a DVCT or an FVCT:

DVCT Chunk: Directory
uint32 - DVCT
byte[76] - unk
byte - name length
byte[23] - unk
byte[name length] - name

FVCT Chunk: File
uint32 - FVCT
byte[40] - unk
uint32 - type
uint32 - creator
byte[16] - unk
uint32 - compressed size of data fork
uint32 - uncompressed size of data fork
uint32 - compressed size of resource fork
uint32 - uncompressed size of resource fork
byte[38] - unk
byte - name length
byte[17] - unk
byte[name length] - name
{In a subfile (how is that set?):}
byte - parentFileNameLength
byte[parentFileNameLength] - parentFileName

The first entry must be a directory. Each file following that directory, up until the next directory, belongs in that directory.